Sealed Shake Flask

Updated: 2026-07-21

Overview

A sealed shaking flask is a specialized laboratory container designed for applications requiring controlled agitation or aeration. It is widely used in microbiology for cell culture, in chemistry for mixing reagents, and in pharmaceuticals for drug development. The flask's sealed design prevents contamination, making it ideal for sensitive experiments. Available in various capacities, from 50 mL to 5 L, sealed shaking flasks are compatible with orbital shakers and incubators. They are typically made from borosilicate glass for chemical resistance or plastic materials like polypropylene for disposable use. The airtight seal ensures no leakage during vigorous shaking.

Structure and Working Principle

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The sealed shaking flask consists of a main body, a neck for pouring or sampling, and a threaded or snap-on cap with a sealing gasket. The gasket, often made of silicone or PTFE, ensures an airtight closure. Some models include vented caps for gas exchange while maintaining sterility. When placed on a shaker, the flask's contents are agitated uniformly, promoting mixing or aeration. The sealed design prevents evaporation and contamination, critical for long-term experiments. The flask's shape, usually conical or cylindrical, maximizes surface area for efficient gas exchange in cell culture applications.

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Key Features

Sealed shaking flasks are designed for durability and performance. Borosilicate glass versions resist thermal shock and chemical corrosion, while plastic flasks are lightweight and shatterproof. The airtight seal is the standout feature, ensuring no sample loss or contamination. Many flasks include graduations for volume measurement and a flat bottom for stability. Some advanced models feature baffles inside the flask to enhance mixing efficiency. The caps are often designed for easy opening and closing, with options for sterile venting to allow gas exchange without compromising the seal.

Application Areas

Sealed shaking flasks are indispensable in microbiology for growing bacterial or yeast cultures. They provide optimal aeration and mixing, essential for cell growth. In chemistry, they are used for dissolving solids, mixing solutions, or conducting reactions under controlled conditions. The pharmaceutical industry relies on these flasks for drug formulation and stability testing. Biotechnology labs use them for protein expression and fermentation processes. Their versatility also extends to environmental testing, where they are used for sample preparation and analysis.

Maintenance and Precautions

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Proper maintenance ensures the longevity of sealed shaking flasks. Glass flasks should be inspected for cracks before use, while plastic flasks should be checked for wear or cloudiness. After use, they should be cleaned thoroughly with appropriate solvents or autoclaved for sterilization. Avoid exposing the flasks to extreme temperatures or rapid temperature changes, which can weaken the material or compromise the seal. Always ensure the cap is securely fastened before shaking to prevent leaks. For sensitive applications, pre-sterilized, disposable flasks may be preferred to eliminate contamination risks.

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B2B Procurement Guide

When purchasing sealed shaking flasks in bulk, consider the material, size, and cap type based on your application. Borosilicate glass is ideal for high-temperature or corrosive substances, while plastic is suitable for disposable or lightweight needs. Verify compatibility with your existing shakers and incubators. Look for suppliers offering certifications like ISO 13485 for medical-grade flasks. Pricing varies by material and quantity, with bulk orders often eligible for discounts. For reference, prices range from $10 to $50 per unit, depending on specifications.